# while 'C':
#     print('我爱鱼C！')
# 死循环
while '':
    print('进入循环')
print('退出循环')

while False:
    print('进入循环')
print('退出循环')

while 0:
    print('进入循环')
print('退出循环')
# i = 10
# while i:
#     print('我爱鱼C！')
#     i = i - 1

# 10 < cost < 50(10 < cost) and (cost < 50)
